NXP Semiconductors TDA7056AT Bedienungsanleitung

DATA SHEET

Product specification 1998 Feb 23

INTEGRATED CIRCUITS

TDA7056AT

3 W mono BTL audio amplifier with

DC volume control

1998 Feb 23 2

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

FEATURES

•DC volume control

•Few external components

•Mute mode

•Thermal protection

•Short-circuit proof

•No switch-on or switch-off clicks

•Good overall stability

•Low power consumption

•Low HF radiation

•ESD protected on all pins.

GENERAL DESCRIPTION

TheTDA7056ATisamonoBridge-TiedLoad(BTL)output

amplifier with DC volume control. It is designed for use in

TVs and monitors, but is also suitable for battery-fed

portable recorders and radios. The device is contained in

a 20-lead small outline package.

A Missing Current Limiter (MCL) is built in.TheMCLcircuit

is activated when the difference in current between the

output terminal of each amplifier exceeds 100 mA

(300 mA typ.). This level of 100 mA allows for

Single-Ended (SE) headphone applications.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

VPsupply voltage 4.5 −18 V

Pooutput power VP=12V;R

L=16Ω33.5−W

Gv(max) maximum total voltage gain VP=12V;R

L=16Ω34.5 35.5 36.5 dB

ΔGvvoltage gain control range 75 80 −dB

Iq(tot) total quiescent current VP=12V;R

L=∞− 816mA

THD total harmonic distortion Po=0.5W −0.3 1 %

TYPE

NUMBER PACKAGE

NAME DESCRIPTION VERSION

TDA7056AT SO20 plastic small outline package with 20 leads; body width 7.5 mm SOT163-1

1998 Feb 23 3

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

positive input

MGM576

TDA7056AT

I +i

17I −i

STABILIZER TEMPERATURE

PROTECTION

DC volume control

Vref

−

positive output

negative output

power

ground

signal

ground

1 to 3, 8 to 13,

16, 18 to 20

n.c.

1998 Feb 23 4

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

PINNING

SYMBOL PIN DESCRIPTION

n.c. 1 not connected

n.c. 2 not connected

n.c. 3 not connected

VP4 positive supply voltage

VI5 positive input

GND1 6 signal ground

VC 7 DC volume control

n.c. 8 not connected

n.c. 9 not connected

n.c. 10 not connected

n.c. 11 not connected

n.c. 12 not connected

n.c. 13 not connected

OUT+ 14 positive output

GND2 15 power ground

n.c. 16 not connected

OUT−17 negative output

n.c. 18 not connected

n.c. 19 not connected

n.c. 20 not connected Fig.2 Pin configuration.

handbook, halfpage

n.c.

GND1

n.c.

OUT−

GND2

OUT+

n.c.

10 11

TDA7056AT

MGM577

1998 Feb 23 5

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

FUNCTIONAL DESCRIPTION

The TDA7056AT is a mono BTL output amplifier with DC

volume control. It is designed for use in TVs and monitors

but is also suitable for battery-fed portable recorders and

radios.

In conventional DC volume circuits the control or input

stage is AC-coupled to the output stage via external

capacitors to keep the offset voltage low. In the

TDA7056ATtheDCvolumecontrolstageisintegratedinto

theinputstagesothat no couplingcapacitorsarerequired.

With this configuration, a low offset voltage is still

maintained and the minimum supply voltage remains low.

The BTL principle offers the following advantages:

•Lower peak value of the supply current

•Thefrequencyoftherippleonthesupplyvoltageistwice

the signal frequency.

Consequently, a reduced power supply with smaller

capacitors can be used which also results in cost

reductions. For portable applications there is a trend to

decrease the supply voltage, resulting in a reduction of

outputpower at conventional outputstages. Using the BTL

principle increases the output power.

The maximum gain of the amplifier is fixed at 35.5 dB.

The DC volume control stage has a logarithmic control

characteristic.

The total gain can be controlled from +35.5 to −44 dB.

If the DC volume control voltage is below 0.3 V, the device

switches to the mute mode.

The amplifier is short-circuit proof to ground, VPand

across the load. A thermal protection circuit is also

implemented. If the crystal temperature rises above

+150 °C the gain will be reduced, thereby reducing the

output power. Special attention is given to switch-on and

switch-off clicks, low HF radiation and a good overall

stability.

Power dissipation

Assume VP=12V;R

L=16Ω.

The maximum sine wave dissipation is 1.8 W.

The Rth vj-a of the package is 60 K/W.

Therefore Tamb(max) =150−60 ×1.8 = 42 °C.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

VPsupply voltage −18 V

V5, 7 input voltage pins 5 and 7 −5V

IORM repetitive peak output current −1.25 A

IOSM non-repetitive peak output current −1.5 A

Ptot total power dissipation Tcase <60 °C−1.5 W

Tamb operating ambient temperature −40 +85 °C

Tstg storage temperature −55 +150 °C

Tvj virtual junction temperature −150 °C

tsc short-circuit time −1h

SYMBOL PARAMETER CONDITIONS VALUE UNIT

Rth(j-a) thermal resistance from junction to ambient in free air 60 K/W

1998 Feb 23 6

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

CHARACTERISTICS

VP=12V;V

DC = 1.4 V; f = 1 kHz; RL=16Ω; Tamb =25°C; unless otherwise specified (see Fig.14).

Notes

1. With a load connected to the outputs the quiescent current will increase, the maximum value of this increase being

equal to the DC output offset voltage divided by RL.

2. The noise output voltage (Vn(o)(rms)) at f = 500 kHz, is measured with Rs=0Ωand B = 5 kHz.

3. The ripple rejection is measured with Rs=0Ωand f = 100 Hz to 10 kHz. The ripple voltage (Vripple =200mVRMS)

is applied to the positive supply rail.

4. The noise output voltage (Vn(o)(rms)) is measured with Rs=5kΩunweighted.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

VPsupply voltage 4.5 −18 V

Iq(tot) total quiescent current RL=∞; note 1 −816mA

Maximum gain (V7=1.4V)

Pooutput power THD = 10%; RL=16Ω33.5 −W

THD total harmonic distortion Po=0.5W −0.3 1 %

Gv(max) maximum total voltage gain 34.5 35.5 36.5 dB

Vi(rms) input signal handling (RMS value) VVC =0.8V;THD<1% 0.5 0.65 −V

Vn(o)(rms) noise output voltage (RMS value) f = 500 kHz; note 2 −210 −μV

B bandwidth at −1dB −0.02 to 300 −kHz

SVRR supply voltage ripple rejection note 3 38 46 −dB

⎪ΔVOS⎪DC output offset voltage ⎪V17 −v14⎪−0 150 mV

Ziinput impedance (pin 3) 15 20 25 kΩ

Minimum gain (V7=0.5V)

Gvvoltage gain −−44 −dB

Vo(n)(rms) noise output voltage (RMS value) note 4 −20 30 μV

Mute position

Vo(mute) output voltage in mute position VVC ≤0.3 V;

VI= 600 mV; note 4 −35 45 μV

DC volume control

ΔGvvoltage gain control range 75 80 −dB

IVC control current VVC =0V 60 70 80 μA

1998 Feb 23 7

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

Fig.3 Quiescent current as a function of the

supply voltage.

V5=1.4V;noload.

handbook, halfpage

MGM578

04 2081216

(mA)

VP(V)

Fig.4 THD as a function of output power.

VDC =1.4V.

(1) VP=12V;R

L=16Ω.

handbook, halfpage

MGM579

Po (W)

THD

(%)

10−1110

(1)

Fig.5 THD as a function of frequency.

VP=12V,P

o= 0.5 W, VDC =1.4V.

(1) RL=16Ω.

handbook, halfpage

MGM580

10 10

f (Hz)

THD

(%)

(1)

Fig.6 Ripple rejection as a function of frequency.

VP=12V;R

L=16Ω; Vr=200mV.

(1) V7=0.3V;R

s=5kΩ.

(2) V7=1.4V;R

s=0Ω.

(3) V7=1.4V;R

s=5kΩ.

handbook, halfpage

100

MGM581

10 10

f (Hz)

(dB)

(2)

(3)

(1)

1998 Feb 23 8

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

Fig.7 Gain control as a function of DC volume

control.

handbook, halfpage

MGM582

−80

−20

−40

0 1.2 2.00.4 1.60.8 V7(V)

gain

(dB)

−60

Fig.8 Noise output voltage as a function of DC

volume control.

Measured with Rs=5kΩunweighted; f = 22 Hz to 22 kHz.

handbook, halfpage

1000

800

400

200

600

0 1.2 2.0

MGM583

0.4 1.60.8

(μV)

V7(V)

Fig.9 Input signal handling as a function of the

supply voltage.

Tamb =25°C; THD = 1%; RL=16Ω; VDC =0.8V.

handbook, halfpage

1000

200

MGM584

400

600

800

04 2081216

(mV)

VP(V)

Fig.10 Output power as a function of the supply

voltage.

Measured at THD = 10%. The maximum output power is limited by

the maximum power dissipation and the maximum available output

current.

(1) RL=8Ω.

(2) RL=16Ω.

(3) RL=25Ω.

handbook, halfpage

MGM585

04 2081216

(W)

VP(V)

(1) (2) (3)

1998 Feb 23 9

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

Fig.11 Total worst case power dissipation as a

function of supply voltage.

(1) RL=8Ω.

(2) RL=16Ω.

(3) RL=25Ω.

handbook, halfpage

0420

MGM586

81216

(W)

VP(V)

(1) (3)(2)

Fig.12 Control current as a function of DC volume

control.

handbook, halfpage

0 1.2 2.0

100

−20

MGM587

−60

−100 0.4 1.60.8 V7(V)

(μA)

1998 Feb 23 10

NXP Semiconductors Product specification

3 W mono BTL audio amplifier with DC

volume control TDA7056AT

Fig.13 Printed-circuit board layout.

handbook, full pagewidth

MGM591

+VP

−OUT

volume

+OUT

TDA7056A/BT

5 kΩ

220 μF

0.47 μF

100 nF

100

GND

D&A AUDIO POWER

CIC NIJMEGEN

b. Top view of component side.

a. Top view of bottom copper.

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